The Bristol Camera Obscura housed in an ancient windmill.

The largest greenhouse in the world is home to over one million types of plants.

Take a sea tractor to the Art Deco hotel on the island that inspired Agatha Christie.

Fascinating town where normal life interfaces with the occult.

A theatre built to house the rowdy Oxford graduation ceremonies became the stage for a debate about God's existence.

A towering spire in the fortress of Kalemegdan honors the victorious armies of Serbia during their struggles against the Ottoman Empire.

Destroyed Serbian army headquarters sits half crumbled in a largely revitalized Belgrade.

Nikola Tesla's ashes are held in a golden sphere, surrounded by his works.

A dramatic sculpture high up in Yorkshire with vistas on an industrial scale.

Each year this small English village becomes overrun with outlandish straw men.

The longest stone bridge in England has an impressive history that dates back over 700 years.

Harry Potter once visited this massive limestone cliff, which was carved by an ancient glacial river.

A long, winding trek rewards you with a gorge so captivating it inspired a painting in the Tate.

Astonishing rock formations dot the Brimham Moor landscape.

Seat of the Duke and Duchess of Devonshire for centuries.

This home of a taxidermy hoarder is among the grandest and most singular of historic English estates.

The bizarre headgear looks like it was made for a fool, not a king.

The National Railway Museum in York is the largest railway museum in the world, attracting almost 1 million visitors per year.

This network of narrow, medieval passages has the most delightful name.

One of the shortest streets in York has an especially odd name.

Follow the original medieval paths that wind through this intriguing section of the city.

Cold war icon and onetime "hole" in the iron curtain.

One of downtown Berlin's last reminders of its Communist past.

The walls of Germany's Parliament still show the scars of the Red Army takeover in World War II.